The First Successful Rigless Monotrip Gas Lift Completion in Mahakam Field

2021 ◽  
Author(s):  
R. Sinaga
Keyword(s):  
Risk Assessment ◽  
Flow Rate ◽  
Improve Efficiency ◽  
Construction Activity ◽  
Lost Time ◽  
Drilling Rigs ◽  
Proper Operation ◽  
Gas Lift ◽  
Solid System

Pertamina Hulu Mahakam (PHM) has applied the Mono Trip Gas Lift (MTGL) completion technique with 27 wells that have been completed by drilling rigs. To improve efficiency, PHM assigned a Hydraulic Workover Unit (HWU) in September 2020 to execute the first rig-less MTGL in the Mahakam field, which is economically feasible based on an internal study. Since HWU has never performed the MTGL cementing, some collaborative works must be done to identify backlog and establish solid procedures for perfect execution. Besides, top of sediment (TOS) was found 16-21 m inside the tubing, which hindered access to the most bottom production zones. Moreover, this project is the first MTGL conducted inside a 7” casing which allows a maximum of 3 barrels per minute (bpm) flow rate (according to packer specification). The flowrate limitation could potentially create higher TOS inside the tubing. Hence, we agreed to utilize a 3.5” landing joint and to apply a higher flow rate for displacing cement as per simulation with rigorous risk assessment and mitigations. As a result, the job was completed in 11.6 days without a lost-time injury, contributing to 12% PHM saving, while the TOS was tagged 13 m above the top of the landing collar by 1.9” macaroni. Despite its success, some lessons are captured as our recommendations, such as improving the sweeping efficiency of the MTGL wiper plugs, establishing a solid system for vital data of cementing job, and developing the infrastructure by HWU contractor to perform the job more successfully. This paper strongly recommends the rig-less operation as an alternative way to reduce the costs of well construction activity. A proper operation can be achieved by learning the lessons, closely managing and monitoring entire job stages. Finally, it encourages partnership and synergy for a better result.

Distribution models for start-up lost time and effective departure flow rate

2013 ◽  
Vol 51 ◽  
pp. 1-11 ◽  
Author(s):  
Jiyuan Tan ◽  
Li Li ◽  
Zhiheng Li ◽  
Yi Zhang
Keyword(s):  
Flow Rate ◽  
Distribution Models ◽  
Start Up ◽  
Lost Time

scholarly journals Optimasi Intermittent Gas lift Pada Sumur AB-1 Lapangan Brownfield

2018 ◽  
Vol 2 (1) ◽  
pp. 32
Author(s):  
Mia Ferian Helmy
Keyword(s):  
Pressure Gradient ◽  
Production Rate ◽  
Flow Rate ◽  
Oil Recovery ◽  
Gas Injection ◽  
Production Method ◽  
Production Flow ◽  
Injection Volume ◽  
Artificial Lift ◽  
Gas Lift

Gas lift is one of the artificial lift method that has mechanism to decrease the flowing pressure gradient in the pipe or relieving the fluid column inside the tubing by injecting amount of gas into the annulus between casing and tubing. The volume of  injected gas was inversely proportional to decreasing of  flowing  pressure gradient, the more volume of gas injected the smaller the pressure gradient. Increasing flowrate is expected by decreasing pressure gradient, but it does not always obtained when the well is in optimum condition. The increasing of flow rate will not occured even though the volume of injected gas is abundant. Therefore, the precisely design of gas lift included amount of cycle, gas injection volume and oil recovery estimation is needed. At the begining well AB-1 using artificial lift method that was continuos gas lift with PI value assumption about 0.5 STB/D/psi. Along with decreasing of production flow rate dan availability of the gas injection in brownfield, so this well must be analyze to determined the appropriate production method under current well condition. There are two types of gas lift method, continuous and intermittent gas lift. Each type of gas lift has different optimal condition to increase the production rate. The optimum conditions of continuous gaslift are high productivity 0.5 STB/D/psi and minimum production rate 100 BFPD. Otherwise, the intermittent gas lift has limitations PI and production rate which is lower than continuous gas lift.The results of the analysis are Well AB-1 has production rate gain amount 20.75 BFPD from 23 BFPD became 43.75 BFPD with injected gas volume 200 MSCFPD and total cycle 13 cycle/day. This intermittent gas lift design affected gas injection volume efficiency amount 32%.

scholarly journals False lumen ejection fraction predicts growth in type B aortic dissection: preliminary results

2019 ◽  
Vol 57 (5) ◽  
pp. 896-903 ◽  
Author(s):  
Nicholas S Burris ◽  
David A Nordsletten ◽  
Julio A Sotelo ◽  
Ross Grogan-Kaylor ◽  
Ignas B Houben ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Growth Rate ◽  
Magnetic Resonance ◽  
Aortic Dissection ◽  
Ejection Fraction ◽  
Flow Rate ◽  
False Lumen ◽  
Type B ◽  
Type B Aortic Dissection ◽  
4D Flow

Abstract OBJECTIVES Current risk assessment strategies in type B aortic dissection are focused on anatomic parameters, although haemodynamic abnormalities that result in false lumen (FL) pressurization are thought to play a significant role in aortic growth. The objective of this study was to evaluate blood flow of the FL using 4D flow magnetic resonance imaging (MRI) and identify haemodynamic and anatomic factors that independently predict the rate of aortic growth. METHODS Patients with dissection of the descending thoraco-abdominal aorta (n = 18) were enrolled in a prospective observational study and underwent 4D flow MRI for haemodynamic assessment of the entry tear and FL. Anatomic parameters were obtained by magnetic resonance angiography and baseline computed tomography. False lumen ejection fraction (FL EF) was defined the ratio of retrograde flow rate at the dominant entry tear during diastole over the antegrade systolic flow rate. RESULTS The median aortic growth rate was 3.5 mm/year (interquartile range 0.5–8.1 mm/year). Entry tear peak velocity was lower in patients with enlarging aortic dimensions (95.5 ± 24.1 vs 128.1 ± 37.4 cm/s, P = 0.039). After adjusting for co-variates FL EF (β = 0.15, P = 0.004), baseline maximal aortic diameter (β = 0.37, P = 0.001) and the entry tear distance from the left subclavian artery (β = 0.07, P = 0.016) were significant predictors of aortic growth rate. CONCLUSIONS Beyond standard anatomic risk factors, FL EF is an independent predictor of aortic growth rate and may represent an intuitive, non-invasive method to estimate FL pressurization and improve patient-specific risk assessment in patients with type B aortic dissection.

Application of Artificial Intelligence to Estimate Oil Flow Rate in Gas-Lift Wells

2020 ◽  
Vol 29 (6) ◽  
pp. 4017-4029 ◽  
Author(s):  
Mohammad Rasheed Khan ◽  
Zeeshan Tariq ◽  
Abdulazeez Abdulraheem
Keyword(s):  
Artificial Intelligence ◽  
Flow Rate ◽  
Oil Flow ◽  
Gas Lift

scholarly journals Traffic Characteristics of Protected/Permitted Left-Turn Signal Displays

2000 ◽  
Vol 1708 (1) ◽  
pp. 28-39 ◽  
Author(s):  
David A. Noyce ◽  
Daniel B. Fambro ◽  
Kent C. Kacir
Keyword(s):  
Response Time ◽  
Flow Rate ◽  
Left Turn ◽  
Start Up ◽  
Green Ball ◽  
Lost Time ◽  
Saturation Flow Rate ◽  
Driver Understanding ◽  
Saturation Flow

At least four variations of the permitted indication in protected/permitted left-turn (PPLT) control have been developed in an attempt to improve the level of driver understanding and safety. These variations replace the green ball permitted indication with a flashing red ball, a flashing yellow ball, a flashing red arrow, or a flashing yellow arrow indication. In addition, the Manual on Uniform Traffic Control Devices allows several PPLT signal display arrangements. The variability in indication and arrangement has led to a myriad of PPLT displays throughout the United States. The level of driver understanding related to each PPLT display type, and the associated impact on traffic operations and safety, has not been quantified. A study was conducted to evaluate the operational characteristics associated with different PPLT signal displays. Specifically, the study quantified saturation flow rate, start-up lost time, response time, and follow-up headway associated with selected PPLT displays. No differences in saturation flow rate and start-up lost time were found due to the type of PPLT signal display. Saturation flow rates ranged from 1,770 to 2,400 vehicles per hour of green per lane and were related to differences in driver behavior between geographic locations. The variation in start-up lost time and response time between locations was primarily related to differences in phase sequence. The flashing red permitted indications were associated with the longest follow-up headway times, since drivers are required to stop before turning left with a flashing red permitted indication. The shortest follow-up headway was associated with the five-section cluster display using a green ball indication.

scholarly journals Development and Validation of a Ultra Flow Liquid Chromatography Method for the Assay of Boceprevir Using a Quality-by-Design Approach

2020 ◽  
Vol 11 (SPL4) ◽  
pp. 3023-3032
Author(s):  
Manish Majumder ◽  
Ramesh B ◽  
Minaketan Tripathy
Keyword(s):  
Risk Assessment ◽  
Flow Rate ◽  
Mobile Phase ◽  
Quality By Design ◽  
Quality Attributes ◽  
Assay Method ◽  
Chromatography Method ◽  
Critical Quality Attributes ◽  
Critical Method ◽  
Quality By Design Approach

Quality by design guided. The assay method of Boceprevir is developed in accordance with ICH Q8(R2) guideline with due validation. .In this process, the Target analytical profile (TAP) of the drug was set and critical method parameters (CMP) were investigated by systematic risk assessment experimentation to control critical Quality Attributes (CQA). In this, A Cause Effect Risk Assessment Matrix with Control-Noise-Experiment (CNX) is used for identifying the high-risk variables i.e Percentage of Organic Modifier (% methanol), pH of the Buffer and flow rate of the mobile phase. The surface response methodology was applied to optimize the critical method parameters (CMP) as well as Critical Quality Attributes (CQA) to find out the Design space of the method. The Optimum assay method condition was mobile phase Acetate Buffer (50mM) pH 5.4: Methanol (11:89), Flow rate: 0.9 ml/min, Lambda Max: 207. The separation was achieved in the Eclip Plus C-18 column (250 × 4.6 mm, 5μm) at ambient temperature. The retention time of Boceprevir was found to be 4.2 min. The method evaluation was performed according to the (Q2R1) ICH guideline.

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